I would look into the csproj for the one correct and one not correct. I would then find the "ProjectGuid" for each and then do a search inside the .sln file to find where they are wired and look for differences. Hope this makes sense. I have the same issue, but unfortunately I dont have even one showing correct.
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Casper Leon NielsenMay 13 '13 at 13:59

I would expect that it will be fixed in the next version of Visual Studio if it isn't fixed in a quarterly update before then. With all of Microsoft moving to shorter release cycles (approximately 12 monthly) then we shouldn't have that long to wait; at least not compared to how long we've had to wait in the past! :-)